Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Note 7 — Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following: 

	March 31, 2020			September 30, 2019			March 31, 2019
Goodwill	$	3,465.5		$	3,456.4		$	3,147.8
Intangible assets:
Customer relationships	$	1,040.4		$	1,038.4		$	782.1
Trademarks and tradenames	11.8			16.2			16.5
Noncompete agreements and other	68.1			46.4			55.2
Accumulated amortization	(478.7		)	(441.8		)	(416.3		)
Intangible assets, net (definite-lived)	641.6			659.2			437.5
Trademarks and tradenames (indefinite-lived)	46.2			49.4			50.8
Total intangible assets, net	$	687.8		$	708.6		$	488.3

Amortization expense of intangible assets was $22.6 and $14.5 for the three months ended March 31, 2020 and 2019, respectively, and $39.4 and $29.1 for the six months ended March 31, 2020 and 2019, respectively. The estimated aggregate amortization expense of intangible assets for the remainder of Fiscal 2020 and for the next four fiscal years is as follows: remainder of Fiscal 2020 — $40.8; Fiscal 2021 — $67.2; Fiscal 2022 — $59.3; Fiscal 2023 — $56.9; Fiscal 2024 — $55.5.